import sys, getopt

def main(argv):
    inputfile = ''
    outputfile = ''
    try:
        # getopt.getopt(args, options, [long_options]) 解析命令行选项和参数列表
        opts, args = getopt.getopt(argv, 'hi:o:', ['ifile=', 'ofile='])
        print(opts)
        print(args)
    except getopt.GetoptError:
        print ('GetoptError, usage: command_line_usage.py -i <inputfile> -o <outputfile>')
        sys.exit(2)
    for opt, arg in opts:
        if opt == '-h':
            print ('usage: command_line_usage.py -i <inputfile> -o <outputfile>')
            sys.exit()
        elif opt in ("-i", "--ifile"):
            inputfile = arg
        elif opt in ("-o", "--ofile"):
            outputfile = arg
    print ('Input file is "', inputfile)
    print ('Output file is "', outputfile)


if __name__ == '__main__':
    main(sys.argv[1:])